MC33567D-1 데이터 시트보기 (PDF) - ON Semiconductor

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MC33567D-1

DUAL LINEAR CONTROLLER FOR HIGH CURRENT VOLTAGE REGULATION

ON Semiconductor 

MC33567

FUNCTIONAL DESCRIPTION

Overcurrent Protection – Hiccup Mode

On detection of overcurrent, output goes into hiccup mode

where on period is 40 times shorter than off time. I.e., 1.0

msec ON, 40 msec OFF. When an overcurrent condition

exists, the output voltage will drop below the threshold. The

output is then turned on and off in a 1:40 duty cycle. Each

transition low to high of the enable input restarts the hiccup

mode holdoff period.

Shutoff (Shutdown) Function

Each internal regulator has an active high enable input. If

the input is held above the minimum threshold, the regulator

Logic table for Shutoff (Pin 3) on the 1.5V regulator:*

Shutoff Pin

1.5V Regulator

Output

No Connect

1.5V

< 0.8V

Shutoff

2.0V < SHDN < 4.2V

1.5V

> 4.1V

3.3V – Full ON

*See Figure 4, 1.5V / 3.3V AGP card detection

NOTE: MC33567–2 does not have full–on bypass feature

will operate normally. If the input is held low, the regulator

is turned off.

Logic table for Shutoff (Pin 3) on the 1.8V regulator:

Shutoff Pin

1.8V Regulator

Output

No Connect

1.8V

< 0.8V

Shutoff

> 2.0V

1.8V

This part has under voltage detection that uses the channel

resistance of an internal N–channel FET to put the regulator

into “hiccup mode” when a short is present on the regulated

 voltage plane. Under voltage detection is set to 75% of

regulation set point.

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